Re: Ampliphone HV board

----- Original Message -----
From: John Robertson <jrr@flippers.com>
To: <vectorlist@mcfeeley.cc.utexas.edu>
> I don't think this would help at all, the problem is not that the
> regulator fails and then the HV croaks, more that the HV transformer
> (Xformer) burns out due to poor design. I suspect the insulation on the
> windings left a bit to be desired.
Heat does it, really...years of off/on cold/hot stresses/cracks the plastic
"Filler" in the FB. If a crack develops in the right place....BOOM! (I have
seen flybacks in 2 peices-blown apart!) The arcing/heat pressurizes the
can...

Aaron Howald
ahowald@w-link.net
>
> Interesting isn't it that on raster monitors, that Electrohome monitors
> eat a LOT of flybacks yet the Wells Gardner raster monitors hardly EVER
> lose one. Yet on the XY monitors, i found that LOTS os Wells Gardner
> Xformers croak, but the Electrohome version seems quite reliable....
>
> John
>
> ("life...don't talk to me about life" Marvin the Paranoid Android)
>
> Jess Askey wrote:
> >
> > What is the the common way in which the HV transformers fail? Is there a
> > certain winding that gets shorted turns from the heat?
> > I think that this has been talked out before, but would replacing the
> > small T0-220 cased +/- 24V regulators with larger T-03 versions ( and
> > eliminating the big hot resistors) help to preserve the HV transformers?
> >
> > MKDUD@aol.com wrote:
> > >
> > > In a message dated 6/5/99 6:19:25 PM Eastern Daylight Time,
davids@oz.net
> > > writes:
> > >
> > > << Any one have a working spare they want to let go of? The quantum I
just
> > > won
> > > on e-bay is missing that board (and the game board but I have that).
> > >
> > > I have like 6 dead HV boards. I keep hopeing Zanen will come up with
an
> > > inexpensive replacement for that transformer.
> > > >>
> > >
> > > Have you tried ringing the transformer to see if that is the
problem - I
> > > use a Bob Parker / Dick Smith LOPT tester. I might be able to repair a
board
> > > for you if your HVT's are not dead. I'm writing an Amplifone HV faq
(yes, it
> > > will be done soon!) that will really help anybody trying to repair
these
> > > boards....
> > >
> > > Michael Kelley
>
> --
> John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
> Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
> mailto:jrr_at_flippers.com, web page http://www.flippers.com
> "Old pinballers never die, they just flip out."
>
>
Received on Sun Jun 6 17:05:52 1999